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Variables

Variables are variables, they should be very similar to the existing CF Conventions, but certain meta data should be added due the complexity of unstructured grid data.

I disagree (TomGross?) See my discussion on UgStrawMan? : The variables are values. Nothing more. In the hierarchy view of describing the grids the smallest elements, the nodes, edges and faces. Do not require an association with the grid they will belong to. In fact they might belong to mulitple grids. The grids have lots of pointers which pick out which nodes etc belong to each cell of the grid.

Examples

Connectivity CDL

Edge Index CDL

Index of the edges which belong to each cell in an order which is specified for each type of cell. This describes which edge data belong to which cell similar to the connectivity that describes which nodes belong to which cell.

Faces Index CDL

Index of the faces which belong to each 3D solid cells in the mesh. The order of faces is specified in for each type of cell similar to the connectivity that describes which nodes belong to which cell.